At Cityskin we tend to prefer the needle technique for lip fillers but cannula can also be used to place filler in the main body of the lip. We find that needle can give greater precision and a much reduced risk of small lumps and bumps that can happen with cannula.There is a slightly higher chance of bruising with needle but we feel that the results that you can achieve far outweigh the short term bruising risk.
Pros of needle: Better placement, quicker procedure, less risks of lumps
Cons of needle: Increased bruising risk
Pros of cannula: Less chance of bruising. Safer as cannula is unlikely to block blood vessels
Cons of cannula: Fiddly technique, procedure takes longer, higher chance of lumps and bumps